(unstack b6 b4)
(putdown b6)
(unstack b4 b5)
(putdown b4)
(unstack b5 b1)
(putdown b5)
(unstack b1 b3)
(stack b1 b4)
(unstack b3 b2)
(stack b3 b5)
(pickup b6)
(stack b6 b2)
(unstack b1 b4)
(stack b1 b6)
; cost = 14 (unit cost)
